Crossword Genius

Unit equal to roughly three and a quarter light years (6)

Ross

I believe the answer is:

parsec

(Other definitions for parsec that I've seen before include "vast length" , "three and a quarter twenty sevens [LIGHT YEARS]" , "Unit for measurement of distance of stars" , "Immense unit of distance" , "Long way" .)

I've seen this clue in The Times.
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